Blackboard



W. I'. JONES. BLAGKBOARD BRASER.

(No Model.)

Patented July 9, 1889..

ATTORNEYS UNITED STATES PATENT OFFICE.

VALTER F. JONES, OF PARISI-I, ASSIGNOR OF ONE-HALF 'lO C. NV. BARDEEN,

OF SYRACUSE, NEV YORK.

BLACKBoARDfERAsm.

SPECIFICATION forming part of Letters Patent No. 406,650, dated July 9, O1889.

Application iiled June 20, 1888. Serial No. 277,697. (No model.)

io blackboard in the operation of the eraser, and which is readily cleaned when desired all as hereinafter more fully described, and

Vspecifically set forth in the claims.

In the annexed' drawings, Figure l is a face View of an eraser embodying my improvements. Figs. 2 and 3 are views of opposite ends of the said eraser. Fig. 4 is a transverse section on line tr Fig. l. Fig. 5 is a transverse section showing the eraser proper 2o in itsinverted position; and Fig. 6 is a portion of a longitudinal section on line y y, Fig. 4.

Similar letters of reference indicate'correspending parts.

B denotes the handle of my improved blackboard-eraser, which handle iselongated. and formed with a longitudinal cavity in its working side, which cavity constitutes the dustreceptacle l, for collecting the dust removed from the blackboard during the operation of the eraser.

e represents the eraser proper or main eraser, consisting of a strip of felt secured to a block t, which occupies the longitudinal central portion of the receptacle l and is pivoted to opposite ends of the receptacle, said eraser being of such a width as to leave dust-entrances d a along opposite sides of the eraser. By means of atongue p, projecting from the back 4o' of the eraser-block t, the dust-receptacle is divided into two compartments, each of which is provided with one of the dust-entrances a. To one of the pivots of the block t is attached athuinb-piece k, by which to turn said block,

remove the dust from the receptacle Z, as represented in Fig. 5 of the drawings.

To the outer end of the handle B is pivoted v the latch g, which is adapted to engage the so as to invert the eraser e whendesired to in its operative position, as represented in Figs. 2 and 6 of the drawings.

In order to insure the collection of the dust inthe receptacle Z, I attach to the end edges of the receptacle thin wooden n strips n n, 5 5 which projectV inward, so asto form ledges, which prevent the dust from falling out of the receptacle during the operation of the eraser, and to these woodenstrips I secure felt strips f f, which extend across the ends 6o of the dust-entrances a d and across the ends of the side edges of the dust-receptacle, as illustrated in Fig. l of the drawings, said felt strips being iiush with the face of the felt of the eraser e, and thus the aforesaid extensions of the ,felt strips ff form guards which further prevent the dust from being thrown out of the receptacle Z during the 0perat-ion of the eraser.

In order to further insure the collection of 7o the dust in the receptacle Z, I attach to the sideedges of the receptacle Valances c c, extending lengthwise thereof. One end of the receptacle l, I provide witlra discharge-opening h, preferably `near the upper corner thereof, as illustrated in Figs. 4 and of the drawings, and to the exterior of the handle B is pivoted 'or otherwise suitablyv` connected a gate c', which is adapted to close the aforesaid dischargefopening, as shown in Fig. 3 of the So drawings. When it is desired to eliminate the dust from vthereceptacle l, the said gate is opened, and by rapping the handle on its back while holding it in an inverted positionthe dust is thrown out of the discharge-opening h. In order to deadenl the noise incident to this rapping, I attach to the back of the handlevB a cushion r, of felt or other suitable elastic material.

y Having described my invention, what I 9o claim as new, and desire to secure by Letters Patent, is

l. In a blackboard-rubber, the handle of which consists of aduSt-receptaole, the eraser situated centrally inthe said receptacle, with dust-entrances at opposite sides of the eraser,

as 'set forth and shown.

2. A blackboard-rubber consisting of a han dle formed with a dust-receptacle, a main eraser situated in said receptacle and eXtendroo ing from end to end thereof, with dust-entrances at opposite sides of the eraser, and eraser-strips extending across the ends of the main eraser and ends of the aforesaid dustentrances, substantially as described and shown.

3. In combination with the handle formed With a dust-receptacle, the eraser situated in said receptacle and extending from end to end thereof, with dust-entrances at opposite sides of said eraser, and a tongue projecting from the back of the eraser and extending lengthwise thereof, substantiall7 as and for the purpose setI forth.

4. In Combination with the handle formed 6. In combination with the handle for1ned` with a dust-receptacle, the eraser occupying the longitudinal central portion of said receptacle and pivoted to opposite ends thereof, a thumb-piece attached toene of the pivots of the eraser, and a latch connected to the end of the handle and adapted to engage the thumb-piece, and thereby lock the eraser in its position, as set forth.

7. In a blackboard-eraser, the combination of the handle, formed with a dust-receptacle and with a discharge-opening at the end of said receptacle, and a gate connected to the handle and adapted to close said opening, as set forth.

8. The combination of the handle formed with a dust-receptacle, the eraser occupying the longitudinal central portion of the receptacle, with dust-entrances at opposite sides of the eraser, a discharge-opening in the corner of one end of the receptacle, and a cushion on the back of the handle to receive the concussion when rapping the handle to expel the dust from the receptacle, substantially as de-V scribed.

WALTER F. JONES.

fitnessesz FRANK BUTLER, CHARLES LE CLAIR. 

